It could be that after living in your head all day, bright colors are just unpleasant.
On a related note, I know 3 couples who party a lot. Large quantities of alchohol and cocaine.
All 3 redecorated their home in gray, black and chrome.
I think we're seeing a drug-induced change in how they appreciate colors.
I find the number of people with bare white walls far stranger.
As someone who is more read I care to be about the culture of early new england I feel very comfortable (and by comfortable, I mean I hate it and I think that it is a terrible trend) saying that the current crop of people who fancy themselves intellectuals and historical puritans have approximately the same politics. They have some radically different beliefs about acceptable behavior but the overarching fundamentals about right vs wrong and community, family and self line up very well. This is not a compliment.
"Impure thoughts are a danger to democracy, access denied."